Appendix A – Non-Compumotor Motors
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E-AC Drive Hardware Installation Guide
SETTING MOTOR CURRENT – NON-COMPUMOTOR MOTORS
To set motor current for a non-Compumotor motor, refer to the formulas
below that correspond to your motor (4-lead, 6-lead, 8-lead) and use the
current settings shown in the DIP switch table (in Chapter 2 Installation)
to set the motor’s current.
WARNING
Do not connect or disconnect the motor with the power on. Doing so will damage the
contacts of the motor connector and may cause personal injury.
4-LEAD MOTORS
If you use a 4-lead motor, the manufacturer’s current specification will
translate directly to the values shown for current in the DIP switch table.
6-LEAD MOTORS
Manufacturers generally use either a bipolar rating or a unipolar rating
for motor current in 6-lead motors.
Bipolar Rating: If the manufacturer specifies the motor current as a
bipolar rating, you can use the DIP switch table’s current settings directly
to set motor current—no conversion is required.
Unipolar Rating: If the manufacturer specifies the motor current as a
unipolar rating:
•Use the following formula to convert the unipolar current rating to the
correct bipolar rating:
Unipolar Current ∗ 0.707 = Bipolar Current
•Use the converted value and the DIP switch table’s current settings to set
the motor current.
8-LEAD MOTORS
Manufacturers generally use either a bipolar rating or a unipolar rating
for motor current in 8-lead motors.
Bipolar Rating: If the manufacturer specifies the motor current as a
bipolar series rating:
•If you wire the motor in series, use the DIP switch table’s current settings
directly.
•If you wire the motor in parallel, you must double the manufacturer’s rating
and then use the DIP switch table’s current settings to set the motor cur-
rent.
Unipolar Rating: If the manufacturer specifies the motor current as a
unipolar rating:
•Use the following formula to convert the unipolar current rating to the
correct bipolar rating:
Unipolar Current ∗ 0.707 = Bipolar Current
•If you wire the motor in series, use the converted value and the DIP switch
table’s current settings to set the motor current.
•If you wire the motor in parallel, you must double the converted value and
use the DIP switch table’s current settings to set the motor current.
If you have questions about setting motor current, call Compumotor’s
Applications Engineering Department at the number shown inside the
front cover.